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MCM2 is one of the highly conserved mini-chromosome maintenance proteins （MCM） that are involved in the initiation of eukaryotic genome replication. The hexameric protein complex formed by MCM proteins is a key component of the pre-replication complex （pre-RC） and may be involved in the formation of replication forks and in the recruitment of other DNA replication related proteins. MCM2 forms a complex with MCM4, 6, and 7, and has been shown to regulate the helicase activity of the complex. MCM2 is phosphorylated, and thus regulated by protein kinases CDC2 and CDC7.